Malicious PDF — malware analysis report

Static analysis result for SHA-256 97161e75d7dff7e9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 18:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 998a21177697d147a60d8436dc4e0529 SHA-1: b728876441974fdb5ceecc89c705144200d29f9d SHA-256: 97161e75d7dff7e94ff2460380e2f134fd7564ade59afbd41ec949f285fd816e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f0796452c06e308c203817ee3f0d3032/vevozisegonamate.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/67535054981.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d096d7490---fogizukotemoperip.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/43002232687.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164b1d1b46---16236225703.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210625014602_eg7klm.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t5j9spkhjhue8ebsmfasajkvr5/83831611073.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/98660888533.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d23dc073334---19505907817.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/dujibomoxisem.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tovapiwikokim.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/91774006400.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gl03ekggtls99k4oqepckc2ri5/52056696918.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/91826719134.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d02a5a4e---36903978210.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3d202192---nalazeninugajibarinewat.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607830e4134be---pawoxifikadobaz.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60F0B1D00A667.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13928505014.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/47188649040.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/gadewigalavejokexu.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/tewodotudixajeso.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/larukanisofo.pdfIn PDF document text
    • http://cold.lt/userfiles/file/sozebiluri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+electoral+roll+assam+2019PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 17324 bytes
SHA-256: 91496b5524a8d04d4cb2eccd6fd580c190a3623f7adebacf5daba497cf4755a4
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10904 bytes
SHA-256: fef86002fa4a67bacb303b2de83fe7332333cc189bdc167f3533c2b5886d64e4